JPH0818335B2 - Sheet-shaped molding material manufacturing equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for producing a sheet-shaped molding material, and more specifically, a resin film is provided on both sides of a kneaded product of a solid substance such as glass fiber and a liquid substance such as resin. Sheet-like
It is suitable for use in FRP molding material manufacturing equipment, especially when manufacturing a thick thick molding compound (hereinafter abbreviated as TMC) by uniformizing the thickness of the sheet material in the width direction. It is something to do.

2. Description of the Related Art Conventionally, the present applicant has previously provided a method as shown in FIG. 7 as a method for producing a sheet-shaped FRP molding material of this type. In the figure, A is a glass roving, B is a paste-like liquid substance composed of a resin component, etc., C and C'are films (polyethylene sheets), and the glass fiber cut to a predetermined length by a roving cutter 1 is a liquid substance. The glass fiber is impregnated with the liquid substance when it is sprayed on the liquid substance B supplied from the supply pipe 2 onto the impregnating rollers 3, 3'and passes between the rotating rollers 3, 3'as shown. Then, the impregnated kneaded material is scraped off by the scraping rollers 4, 4'arranged below the rollers 3, 3'and dropped on the lower film C on the conveyor 5 to make a constant amount of the kneaded material. Is covered with an upper film C ', and then shaped by a shaping roller 6 into a sheet-like product,
It is transported to the subsequent process.

Problems of the Prior Art In the above-described manufacturing apparatus, when the kneaded product is dropped onto the lower film C on the conveyor 5, the conventional drop distance (the drop distance from the scraping rollers 4, 4'to the film C is large). Then, the kneaded material did not fall on the lower film C in a uniform amount in the width direction, there were many in the central part and few in both sides,
The distribution state is shown by the broken line in FIG. Therefore, the manufactured product has a thick central part in the width direction of the sheet and is relatively thin on both side parts, so that a product having a uniform width cannot be manufactured.

In order to solve the above-mentioned problems, the present inventor conducted an experiment, and as shown in FIG. 9, the scraping roller 4,
It was found that when the dropping distance from 4'to the film C was shortened and the film C was arranged directly below the rollers 4, 4 ', the kneaded product could be dropped almost uniformly in the width direction. However, in that case, the kneaded material scattered on the film C is scattered from the gap between the scraping rollers 4, 4'and the film C to the outside of the system in a large amount of 5 to 10% of the total amount, and a large amount of raw material loss is caused. At the same time, the problem of contaminating the side wall arose.

Further, in the conventional apparatus, when the liquid substance B is supplied to the impregnating rollers 3, 3 ', as shown in FIG. It is supplied onto the rollers 3, 3'through holes 2a of the same diameter which are formed at a constant pitch in the length direction. In that case, pipe 2
In the inside, the pressure is high on the upstream side of the pump 9 and decreases as it goes to the downstream side of the tip side. Therefore, the supply amount of the liquid substance B is large on the impregnating rollers 3, 3 ′ on the upstream side.
The supply amount decreases on the downstream side, and the liquid substance B is not supplied in a uniform amount over the entire width direction. The uneven supply of the liquid substance B is also a cause of hindering the uniformization of the thickness of the manufactured product in the width direction.

The object of the present invention is to solve the above problems, first, to reduce the drop distance from the scraping roller to the lower film to eliminate uneven supply to the lower film of the kneaded product, in that case The scattering from the gap between the scraping roller and the lower film, which is a problem, is prevented by disposing a scattering prevention roller at a position described later set from the relationship between the scraping roller and the film, By improving the holes in the liquid substance supply pipe so that the liquid substance can be evenly and uniformly supplied over the entire axial direction of the impregnating roller, the thickness of the sheet molding material produced can be made uniform in the width direction. is there.

In order to achieve the above-mentioned object, the present invention is to pass between a pair of impregnating rollers in which a viscous liquid substance composed of a glass fiber and a resin component or the like is arranged oppositely,
After scraping off the kneaded material of the glass fiber and the liquid substance with a pair of scraping rollers arranged below each impregnating roller with a gap, and dropping it onto the lower film arranged below, In an apparatus for producing a sheet-shaped molding material by covering an upper film on the upper surface of a kneaded product, the lower film is arranged substantially horizontally from the supply side with a gap immediately below the pair of scraping rollers, and the lower film is supplied. A scattering prevention roller is provided behind the scraping roller on the side, and the point where the common tangent line that contacts the lower end surface of this roller and the lower end surface of the scraping roller intersects the supply line of the lower film is Located in the rear,
Also, the diameter of the scattering prevention roller is set to a diameter that is in contact with or close to the lower film and is also close to the impregnating roller on the same side, and the scattering prevention roller prevents scattering of the kneaded material to the outside of the system. An apparatus for producing a sheet-shaped molding material is provided.

Further, on the other scraping roller side of the upper film supply side facing the scraping roller of the lower film supply side, an extension line of a common tangent line outside the scraping roller and the impregnating roller on the same side. And the upper film supply line for covering the upper surface of the kneaded material intersect on the impregnating roll side, and the kneaded material that scatters on the roller side scatters on the upper film and does not fly out of the system. It is the one.

The impregnating roller and the scraping roller described above,
A scraping roller is arranged close to the lower surface of the impregnating roller with a gap of 0.05 mm to 2 mm, and the scraping roller is rotated in the same direction as the pair of impregnating rollers at 1,000 to 10,000 rpm. The kneaded product is scraped off from the surface of the impregnating roller by rotating it by a number. Also, the thickness of the kneaded material to be placed on the lower film at this time is 20 mm.
When set to, the gap between the scraping roller on the lower film supply side and the lower film is approximately 20
With the mm, the gap between the scattering prevention roller and the lower film arranged on the outside of the scraping roller is a dimension in which the common tangent line of the scattering prevention roller and the scraping roller intersects with the lower film at the rear, While completely preventing the kneaded material from scattering from the gap, the gap between the scattering prevention roller and the impregnating roller is made small, and the load on the rotation of the impregnating roller is abnormal due to the kneaded material adhering to both rollers. It prevents the kneaded material from scattering from the gap while preventing the kneading. Furthermore, the gap between the scraping roller on the upper film supply side and the lower film is 40 mm (the gap between the kneaded material and the scraping roller is 20 mm), and the upper film guide roller and the lower film that make the upper film face the upper surface of the lower film. The gap between and is set to 30 mm (the gap between the kneaded material and the upper film is 10 mm).

Further, in the present invention, in order to uniformly supply the liquid substance to the entire axial direction of the impregnating roller, the opening area for the liquid substance supply to be bored in the supply pipe, in relation to the pressure in the pipe, The opening area is small on the high upstream side, while it is large on the downstream side where the pressure is low. The opening area of the liquid is increased, and therefore, the liquid substance can be uniformly supplied.

The above-mentioned opening of the liquid substance is required to have a diameter of 0.7 mm or more in order to prevent foreign matter from being caught, and it has been proved from the experimental results that the distance between the openings is preferably 10 mm or less. . Therefore, for example, when the length of the supply pipe is 1000mm (the length of the impregnating roller in the axial direction is 1000mm), 1.9φ, 2.0φ, 2.1φ holes are formed at a pitch of 3.5mm. By combining several types of holes with different diameters, the opening area per length is made larger toward the downstream side.

The liquid substance used in the present invention includes unsaturated polyester resin, liquid resin such as polystyrene in styrene solution, liquid styrene monomer, powder calcium carbonate, filler such as aluminum hydroxide, powder zinc stearate, calcium stearate. Internal release agent such as BPO (benzoyl peroxide) in liquid or paste, TBPB (t
-Butylperbenzoate) and other catalysts, powdered HQ (hydroquinone), PBQ (parabenzoquinone) and other compounding stabilizers, and a MgO paste (magnesia paste) thickener and liquid It is a mixture of various colorants.

The glass fiber used as a reinforcing material for the solid substance mixed on the impregnating roller with the liquid substance is 12μ, TEX4
630 glass roving cut into a predetermined length of about 1 ″ is used.

A polyethylene film or a polypropylene film is used as a sheet for covering the upper and lower surfaces of the kneaded product obtained by mixing the paste-like material and the solid substance.

The sheet-shaped molding material formed by coating both surfaces of the kneaded material with a film has a thickness of about 5 to 10 mm and a width of 0.55 mm.
Targeting TMC of approximately 1 m, the sheet-shaped molding material is molded into products for various uses by a molding method such as compression. For example, housing equipment such as a bathtub, a waterproof pan, a water tank panel, and a balcony, an air spoiler for automobile equipment, an air intake, a roof, a side panel, an engine hood, a chair, a tray, a parabolic antenna, and the like can be preferably manufactured.

Examples Hereinafter, the present invention will be described in detail with reference to Examples shown in the drawings. The same components as those in the conventional example shown in FIG. 7 are designated by the same reference numerals.

FIG. 1 shows the apparatus used in the examples. In FIG. 1, a roving cutter 1 is rotatably mounted on the upper end of a frame 10 of an impregnating device, a roving cutter 1 is rotated by a motor 11, and a glass roving A that descends between a facing roller 12 is moved to a predetermined length. The glass fiber is cut into small pieces, and the cut glass fibers are dropped onto the impregnating rollers 3, 3 ′ arranged below. The impregnating rollers 3, 3'are rotated inward by a motor 22 or the like as shown by the arrow. The impregnating rollers 3, 3'usually have a diameter of about 100 to 1000 mm.
The gap between them is usually about 2-10 mm, and the rotation speed is usually about 10-
200 rpm is preferable. These impregnating rollers 3,
On the upper surface of 3 ', liquid material supply pipes 13 and 13' described later are provided.
And the liquid substance B is sprayed from the pipes 13 and 13 'onto the surfaces of the impregnating rollers 3 and 3'. Therefore, the glass fiber is impregnated with the liquid substance B when passing through the gap between the impregnating rollers 3, 3 ′, and the impregnated kneaded material moves downward along the surface of the rollers 3, 3 ′.

Scraping rollers 4 and 4'are arranged below the impregnating rollers 3 and 3 ', respectively.
4'is rotated at high speed in the same direction as the upper impregnating rollers 3, 3'by motors 14, 15. The scraping roller 4,
The diameter of 4'is preferably smaller than that of the impregnating rollers 3, 3 ', usually about 50 to 200 mm, and the rotation speed is much larger than that of the rollers 3, 3', usually about 1000 to 10000 rpm.
In addition, the gap between the rollers 3 and 4, 3'and 4'is usually about 0.05 to 2 mm. The scraping rollers 4 and 4 ′ scrape off the kneaded material that moves along the surfaces of the impregnating rollers 3 and 3 ′ and drop it onto the lower film C which is supplied downward.

The lower film C is fed from the lower film unwinder 16 via the guide roller 1 to a position immediately below the scraping rollers 4 and 4 ', as shown in FIG. The side is inclined downward to supply. On the supply side of the lower film C, a roller 18 for preventing scattering of the kneaded material is provided outside the scraping roller 4'and at a position between the upper surface of the lower film C and the lower surface of the impregnating roller 3 '.
Has been arranged. As for the disposition position of the scattering prevention roller 18, the common tangent line X ₁ between the lower end surface of the scraping roller 4 ′ and the lower end surface of the scattering prevention roller 18 intersects with the supply line of the lower film C at the rear point P ₁ . Is set. Therefore, the roller 18 and the lower film C are brought close to or in contact with each other to the extent that a load is not exerted on their operation. Further, the gap between the roller 18 and the impregnating roller 3'is also close to each other within a range in which no load is exerted on their rotation.

On the other hand, the upper film C ′ is guided from the upper film unwinder 19 through the guide roller 20, and is finally guided by the final guide roller 20 ′ arranged below the impregnating roller 3 and outside the scraping roller 4. Supply above C. And, the position as 'on the film C' to the supply line, the common tangent X ₂ outside the impregnating rolls 3 and scraping rollers 4 intersect at the intersection P ₂ of the impregnation roller side the final guide roller 20 The kneaded material scattered from the gap between the scraping roller 4 on the supply side of the upper film and the lower film C adheres to the upper film C ′ to prevent scattering to the outside of the system.

The distance between the lower film C and each roller is set as follows in this embodiment when the thickness of the kneaded material is 20 mm.

The gap (a) between the shatterproof roller 18 and the impregnating roller 3'is 8 mm, the gap (b) between the shatterproof roller 18 and the lower film C is 3 mm, and the gap (c) between the scraping roller 4'and the lower film C (c). ) Is 20 mm, the gap (d) between the scraping roller 4 and the lower film C is 40 mm, and the gap (e) between the guide roller 20 'and the lower film C is 30 mm.

On the other hand, the supply pipes 13 and 13 'for spraying the liquid substance B onto the impregnating rollers 3 and 3'are located below the impregnating rollers 3 and 3'as shown in FIGS. Two rows of openings 21 are formed on the side surface, each of which is a round hole having one pitch in the axial direction. The opening has three different diameters (1.
9φ, 2.0φ, 2.1φ), and these openings 21 are combined so that the opening area per length is 5th from the upstream side of the pump for pumping (not shown) side to the downstream side of the pipe tip.
As shown in the figure, the values are sequentially increased. in this way,
The impregnation roller 3 has a small opening area on the upstream side where the internal pressure is high and has a large opening area on the downstream side where the pressure is low.
A substantially uniform liquid substance B is sprayed over the entire axial direction of 3 '.

According to the impregnating apparatus having the above structure, the lower film C is arranged immediately below the scraping rollers 4, 4 ', and the liquid substance B is evenly distributed on the surfaces of the impregnating rollers 3, 3'over the entire axial direction. Since they are scattered, the glass fibers, the liquid substance, and the kneaded product thereof can be supplied almost uniformly over the entire width direction of the lower film C. According to the experimental result, the distribution state in the width direction by this device is
As shown by the solid line in the figure, it is obvious that the effect of homogenization is greater than that of the distribution state shown by the broken line in the conventional device.

Further, when the lower film C is arranged immediately below the scraping roller, many kneaded products mainly scatter from the gap between the scraping 4'and the lower film C, but the scraping roller 4'and the lower film C are common. Since the scattering prevention roller 18 is arranged on the tangent line, the roller 18 prevents the scattering and prevents the kneaded product from jumping out of the system and contaminating the environment.

The present invention is not limited to the above-described embodiment, and for example, the openings formed in the liquid material supply pipes 13 and 13 'are not limited to round holes, and the openings may be formed by changing the pitch. Alternatively, the opening area may be changed in relation to the pressure so that a uniform amount of the liquid substance can be dispersed in the length direction of the pipe.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the device of the present invention, the kneaded product is uniformly distributed over the entire width direction of the film by disposing the lower film immediately below the scraping roller. Can be done. And, since the scattering of the kneaded material that occurs when the lower film is arranged directly below can be surely prevented by the arrangement of the scattering prevention rollers,
It is possible to eliminate the loss of raw materials, reduce costs, and prevent environmental pollution due to scattering outside the system. Furthermore, since the liquid substance is sprayed on the impregnating roller almost uniformly over the entire axial direction, the uniform distribution of the kneaded product in the width direction can be enhanced also from this point. Thus, the kneaded product can be uniformly distributed in the width direction, so that the sheet-shaped molding material produced has a uniform thickness in the width direction. In particular, since it was difficult to easily manufacture TMC with a uniform wall thickness in the past, this device has an epoch-making effect that it is possible to manufacture a TMC with a uniform wall thickness. .

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an apparatus according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a sectional view of a liquid substance supply pipe, and FIG. 4 is FIG. Side view of the pipe,
FIG. 5 is a diagram showing the opening area per length of the pipe,
FIG. 6 is a diagram comparing the distribution state in the width direction by the device according to the present invention and the distribution state by the conventional device, FIG. 7 is a schematic view showing a conventional example, and FIG. 8 is a conventional liquid substance supply FIG. 9 is a schematic view showing a pipe, and FIG. 9 is a schematic view showing problems when the lower film is arranged directly below the roller. 1 ... Roving cutter, 3,3 '... Impregnation roller, 4,4' ... Scraping roller, 18 ... Scatterproof roller, A ... Glass roving, B ... Liquid substance, C ... Lower film, C '... upper film.

Claims (3)

[Claims] 1. A solid substance such as glass fiber and a viscous liquid substance such as a resin component are disposed so as to face each other and passed through a pair of impregnating rollers that rotate inward, and below each impregnating roller. After scraping off the kneaded material of the glass fiber and the liquid substance with a pair of scraping rollers arranged with a gap and dropping it onto the lower film arranged below, the upper film is placed on the upper surface of the kneaded material on the film. In a device for producing a sheet-shaped molding material by covering the above, the pair of scraping rollers is arranged substantially horizontally from the supply side with a gap immediately below, and the scraping roller of the lower film supply side is A scattering prevention roller is provided on the rear side, and the point where the tangent line contacting the lower end surface of the scattering prevention roller and the lower end surface of the scraping roller intersects the supply line of the lower film is Set so that it is behind the anti-scattering roller, and the diameter of the anti-scattering roller is set to a size that is in contact with or close to the lower film and is close to the impregnating roller on the same side. An apparatus for producing a sheet-shaped molding material, characterized in that a kneading roller prevents the kneaded material from scattering outside the system. 2. The apparatus according to claim 1, wherein the scraping roller on the other side of the upper film supply side facing the scraping roller on the lower film supply side is for scraping. A kneaded product that is set so that the extension line of the common tangent line on the outside of the roller and the impregnating roller on the same side and the supply line of the upper film that covers the upper surface of the kneaded product intersect on the impregnated roll side, and scatters on the roller side Is a device for manufacturing a sheet-shaped molding material, characterized in that it is scattered on the upper film so as not to jump out of the system. 3. The apparatus according to claim 1, wherein the opening area for supplying the liquid substance, which is formed in the pipe for supplying the liquid substance, has a high pressure in relation to the pressure in the pipe. On the upstream side, while making the opening area per length small,
On the downstream side where the pressure is low, the opening area per length is large so that the liquid substance can be supplied uniformly from the supply pipe to the entire impregnation roller in the axial direction. .